Drop all timeline seeks outside of the seekable range.

Source/core/html/shadow/MediaControlElements.cpp

Index: Source/core/html/shadow/MediaControlElements.cpp
diff --git a/Source/core/html/shadow/MediaControlElements.cpp b/Source/core/html/shadow/MediaControlElements.cpp
index 2439bb62e1be659462f2a824b329da9646fcf7fd..ecf407457684f156fd0e13da09c8e0dd43139111 100644
--- a/Source/core/html/shadow/MediaControlElements.cpp
+++ b/Source/core/html/shadow/MediaControlElements.cpp
@@ -37,6 +37,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/MediaController.h"
+#include "core/html/TimeRanges.h"
 #include "core/html/shadow/MediaControls.h"
 #include "core/html/track/TextTrack.h"
 #include "core/html/track/vtt/VTTRegionList.h"
@@ -418,10 +419,12 @@ void MediaControlTimelineElement::defaultEventHandler(Event* event)
     if (event->type() == EventTypeNames::input) {
         // FIXME: This will need to take the timeline offset into consideration
         // once that concept is supported, see https://crbug.com/312699
-        if (mediaElement().controller())
-            mediaElement().controller()->setCurrentTime(time);
-        else
+        if (mediaElement().controller()) {
+            if (mediaElement().controller()->seekable()->contain(time))
+                mediaElement().controller()->setCurrentTime(time);
+        } else if (mediaElement().seekable()->contain(time)) {
             mediaElement().setCurrentTime(time, IGNORE_EXCEPTION);
+        }
     }
 
     RenderSlider* slider = toRenderSlider(renderer());